is there a way to force sendmail to authenticate the users if the
email sender field is "From firstname.lastname@example.org
this because i receive a lot of emails where the sender smtp field is
forged by spammers, this enables them to send emails to my domain without being authenticated.
I would also like to force authentication to "group" emails account
) only to authenticated users? this would
limit the spam from users@other_domain.com
maybe i could implement those features with spamassassin although sendmail maybe seems more right, what do you think?
my version: Sendmail 8.13.1/8.13.1
thankyou very much !